It depends what kind of leak down test... toilet tank leak down test sure use water... that way you know the valve is sealed and ready to release the rush of water resulting in a flushing away of human waste, dead goldfish, or whatever stuff little kids try to flush (burger king cup lid and a nightlight are my claims to fame when I was a rugrat)
Someone once wrote in to Hotrod mag during the wings and dams era and ask how would you spoil a Marlin. The reply was "you don't have to. They came prespoiled from the factory".
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